Commons Collections example source code file (TestPredicatedSortedBag.java)

This example Commons Collections source code file (TestPredicatedSortedBag.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons Collections tags/keywords

bag, comparator, expecting, illegalargumentexception, illegalargumentexception, predicate, predicatedsortedbag, sortedbag, sortedbag, string, string, testpredicatedsortedbag, treebag, treebag, util

The Commons Collections TestPredicatedSortedBag.java source code

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.apache.commons.collections.bag;

import java.util.Comparator;

import junit.framework.Test;
import junit.framework.TestSuite;

import org.apache.commons.collections.Bag;
import org.apache.commons.collections.Predicate;
import org.apache.commons.collections.PredicateUtils;
import org.apache.commons.collections.SortedBag;

/**
 * Extension of {@link TestBag} for exercising the {@link PredicatedSortedBag}
 * implementation.
 *
 * @since Commons Collections 3.0
 * @version $Revision: 646780 $ $Date: 2008-04-10 13:48:07 +0100 (Thu, 10 Apr 2008) $
 * 
 * @author Phil Steitz
 */
public class TestPredicatedSortedBag extends AbstractTestSortedBag {
    
    private SortedBag nullBag = null;
    
    public TestPredicatedSortedBag(String testName) {
        super(testName);
    }
    
    public static Test suite() {
        return new TestSuite(TestPredicatedSortedBag.class);
    }
    
    public static void main(String args[]) {
        String[] testCaseName = { TestPredicatedSortedBag.class.getName()};
        junit.textui.TestRunner.main(testCaseName);
    }
    
    //--------------------------------------------------------------------------
    
    protected Predicate stringPredicate() {
        return new Predicate() {
            public boolean evaluate(Object o) {
                return o instanceof String;
            }
        };
    }   
    
    protected Predicate truePredicate = PredicateUtils.truePredicate();
    
    protected SortedBag decorateBag(SortedBag bag, Predicate predicate) {
        return PredicatedSortedBag.decorate(bag, predicate);
    }
    
    public Bag makeBag() {
        return decorateBag(new TreeBag(), truePredicate);
    }
    
    protected Bag makeTestBag() {
        return decorateBag(new TreeBag(), stringPredicate());
    }
    
    //--------------------------------------------------------------------------
    
    public void testDecorate() {
        SortedBag bag = decorateBag(new TreeBag(), stringPredicate());
        SortedBag bag2 = ((PredicatedSortedBag) bag).getSortedBag();
        try {
            SortedBag bag3 = decorateBag(new TreeBag(), null);
            fail("Expecting IllegalArgumentException for null predicate");
        } catch (IllegalArgumentException e) {}
        try {
            SortedBag bag4 = decorateBag(nullBag, stringPredicate());
            fail("Expecting IllegalArgumentException for null bag");
        } catch (IllegalArgumentException e) {}
    }
    
    public void testSortOrder() {
        SortedBag bag = decorateBag(new TreeBag(), stringPredicate());
        String one = "one";
        String two = "two";
        String three = "three";
        bag.add(one);
        bag.add(two);
        bag.add(three);
        assertEquals("first element", bag.first(), one);
        assertEquals("last element", bag.last(), two); 
        Comparator c = bag.comparator();
        assertTrue("natural order, so comparator should be null", c == null);
    }

    public String getCompatibilityVersion() {
        return "3.1";
    }

//    public void testCreate() throws Exception {
//        Bag bag = makeBag();
//        writeExternalFormToDisk((java.io.Serializable) bag, "D:/dev/collections/data/test/PredicatedSortedBag.emptyCollection.version3.1.obj");
//        bag = makeBag();
//        bag.add("A");
//        bag.add("A");
//        bag.add("B");
//        bag.add("B");
//        bag.add("C");
//        writeExternalFormToDisk((java.io.Serializable) bag, "D:/dev/collections/data/test/PredicatedSortedBag.fullCollection.version3.1.obj");
//    }

}